HE693CDC300

幀消息由源和目標介質訪問控 制（media?access?control?）MAC ? 13? 地址組成，并利用該信息和 數據區的內容建立CRC尾。數據鏈路層根據網絡采用拓撲規則，發送幀， 把幀發到物理層（網絡線纜）。網橋和交換器是數據鏈路層的設備。因 為它們是支持幀的。兩者都利用幀消息頭中的信息調節交通。幀消息頭 負責識別是誰發送的信息，信息發送到哪里。幀消息頭包含兩個區域， 用以識別傳輸的源和目標，是源和目標系統的節點地址。幀消息頭的大 小總是14字節。? ?

HE693CDC300

聯系人：郭先生
聯系電話：18971415643《優先》
座機：027-83238871
傳真：207-61537051
QQ：810334512《優先》

HE693CDC300

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